摘要
为研究具有层状特征的节理岩巷应力分布规律与变形机制及控制对策,通过将巷道直墙拱形断面等效为圆形断面,分析层状节理岩巷应力分布和应力集中影响,并以云南某矿埋深为750 m的阶段运输巷道为研究对象,通过现场调查和Phase 2数值模拟等方法,分析了巷道变形机制并给出了相应的支护对策。结果表明:通过粒子群算法得出的巷道应力集中影响可知,在巷道极角为135°、岩层倾角为45°时巷道应力集中影响指标最大;分析了围岩的变形破坏机制,围岩内节理发育,在地应力的作用下裂隙向深部扩展,最终导致围岩变形破坏;通过对设计的非对称支护方案进行分析,该方案可有效控制围岩变形,保证巷道围岩的整体稳定。研究结果可为该类节理岩巷变形机制分析及控制提供借鉴。
In order to study the stress distribution law,deformation mechanism and control countermeasures of the laminated rock tunnel with layered characteristics,the phase transportation tunnel with a buried depth of 750 m in a mine in Yunnan is used as the study object.The stress distribution and stress concentration effects of laminated rock tunnel are analyzed by equating the straight wall arched section of the tunnel to a circular section.Through field investigation and Phase 2 numerical simulation,the deformation mechanism of the tunnel is analyzed and the corresponding support countermeasures are given.The impact of tunnel stress concentration derived by the particle swarm algorithm shows that the tunnel stress concentration has the largest impact index when the tunnel polar angle is 135°and the rock dip angle is 45°;The deformation and failure mechanism of the surrounding rock is analyzed,and the joints in the surrounding rock are developed.Under the action of in-situ stress,the fissure expands to the deeper part,and finally leads to the deformation and destruction of the surrounding rock.Through the analysis of the designed asymmetric support scheme,the shceme can effectively control the deformation of the surrounding rock and ensure the overall stability of the tunnel's surrounding rock.The research results can provide a reference for the analysis and control of the deformation mechanism of this type of jointed rock tunnel.
作者
刘博
李克钢
李旺
刘尉俊
秦庆词
李明亮
吴苏
LIU Bo;LI Kegang;LI Wang;LIU Weijun;QIN Qingci;LI Mingliang;WU Su(Faculty of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,Kunming 650093,China;Yunnan Chihong Zn & Ge Co., Ltd.,Qujing 655011,China;Key Laboratory of Rock Mechanics and Embankment Engineering of Ministry of Education,Hohai University,Nanjing 210098,China;Geotechnical Research Institute,Hohai University,Nanjing 210098,China)
出处
《有色金属工程》
CAS
北大核心
2022年第2期106-113,共8页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(41672303)。
关键词
层状节理
应力分布
变形机制
支护
数值模拟
lamellar joint
stress distribution
deformation mechanism
support
numerical simulation
